Method for modifying a bit sequence in an ARQ restransmission, receiver and transmitter therefor

Abstract

An ARQ transmission method in a communication system, wherein data packets comprising modulation symbols are transmitted based on an automatic repeat request and subsequently combined with previously received data packets. The symbols of the transmitted data packets are modulated in a mapping entity employing at least a first and second signal constellation. The method further comprises the step of obtaining the second signal constellation from the first signal constellation by exchanging a logical bit position and/or inverting a logical bit. The invention further relates to a corresponding transmitter and receiver.

What is claimed is:  
     
       1. A transmission apparatus comprising: 
       a transmission section that (i) transmits a first data arranged in a first 16 QAM constellation pattern in a first transmission, and (ii) retransmits a second data arranged in a second 16 QAM constellation pattern in a retransmission, wherein said second 16 QAM constellation pattern is a rearrangement of said first 16 QAM constellation pattern, and maid rearrangement includes an inversion of a logical bit value for a part of said second data, and wherein, in said first transmission, a bit sequence (i 1 q 1 i 2 q 2 ) is used as said first 16 QAM constellation pattern, and, in said retransmission, said bit sequence is modified, to obtain said second 16 QAM constellation pattern, by exchanging positions of i 1  and i 2 , by exchanging positions of q 1  and q 2 , and by logically inverting i 1  and q 1 .  
     
     
       2. A transmission apparatus comprising: 
       a transmission section that (i) transmits a first data arranged in a first 16 QAM constellation pattern in a first transmission, and (ii) retransmits a second data arranged in a second 16 QAM constellation pattern in a retransmission, wherein said second 16 QAM constellation pattern is a rearrangement of said first 16 QAM constellation pattern, and said rearrangement includes an inversion of a logical bit value for a part of said second data, and wherein, in said first transmission, a bit sequence (i 1 q 1 i 2 q 2 ) is need as said first 16 QAM constellation pattern, and, in said retransmission, said bit sequence is modified, to obtain said second 16 QAM constellation pattern, by exchanging positions of i 1  and i 2 , by exchanging positions of q 1  and q 2 , and by logically inverting i 2  and q 2 .  
     
     
       3. A transmission apparatus comprising: 
       a transmission section that (i) transmits a first data arranged in a first 16 QAM constellation pattern in a first transmission, and (ii) retransmits a second data arranged in a second 16 QAM constellation pattern in a retransmission, wherein said second 16 QAM constellation pattern is a rearrangement of said first 16 QAM constellation pattern, and said rearrangement includes an inversion of a logical bit value for a part of said second data, and wherein, in said first transmission, a bit sequence (i 1 q 1 i 2 q 2 ) is used as said first 16 QAM constellation pattern, and, in said retransmission, said bit sequence is modified, to obtain said second 16 QAM constellation pattern, by logically inverting i 2  and q 2 .  
     
     
       4. The transmission apparatus according to  claim 1 ,  2  or  3 , wherein said rearrangement is performed such that a mean bit reliability for each bit mapped onto a symbol is averaged out through repetition provided by said retransmission. 
     
     
       5. The transmission apparatus according to  claim 1 ,  2  or  3 , wherein the data is Gray encoded. 
     
     
       6. A base station apparatus equipped with the transmission apparatus according to  claim 1 ,  2  or  3 . 
     
     
       7. A communication terminal apparatus equipped with the transmission apparatus according to  claim 1 ,  2  or  3 . 
     
     
       8. A transmission method comprising: 
       transmitting a first data arranged in a first 16 QAM constellation pattern in a first transmission; and  
       retransmitting a second data arranged in a second 16 QAM constellation pattern in a retransmission, wherein:  
       said second 16 QAM constellation pattern is a rearrangement of said first 16 QAM constellation pattern,  
       said rearrangement includes an inversion of a logical bit value for a part of said second data,  
       in said first transmission, a bit sequence (i 1 q 1 i 2 q 2 ) is used as said first 16 QAM constellation pattern, and  
       in said retransmission, said bit sequence is modified, to obtain said second 16 QAM constellation pattern, by exchanging positions of i 1  and i 2 , by exchanging positions of q 1  and q 2  and by logically inverting i 1  and q 1 .  
     
     
       9. A transmission method comprising: 
       transmitting a first data arranged in a first 16 QAM constellation pattern in a first transmission; and  
       retransmitting a second data arranged in a second 16 QAM constellation pattern in a retransmission, wherein:  
       said second 16 QAM constellation pattern is a rearrangement of said first 16 QAM constellation pattern,  
       said rearrangement includes an inversion of a logical bit value for a part of said second data,  
       in said first transmission, a bit sequence (i 1 q 1 i 2 q 2 ) is used as said first 16 QAM constellation pattern, and  
       in said retransmission, said bit sequence is modified, to obtain said second 16 QAM constellation pattern, by exchanging positions of i 1  and i 2 , by exchanging positions of q 1  and q 2 , and by logically inverting i 2  and q 2 .  
     
     
       10. A transmission method comprising: 
       transmitting a first data arranged in a first 16 QAN constellation pattern in a first transmission; and  
       retransmitting a second data arranged in a second 16 QAM constellation pattern in a retransmission, wherein:  
       said second 16 QAM constellation pattern is a rearrangement of said first 16 QAM constellation pattern,  
       said rearrangement includes an inversion of a logical bit value for a part of said second data,  
       in said first transmission, a bit sequence (i 1 q 1 i 2 q 2 ) is used as said first 16 QAM constellation pattern, and  
       in said retransmission, said bit sequence is modified, to obtain said second 16 QAM constellation pattern, by logically inverting i 2  and q 2 .  
     
     
       11. A transmission apparatus comprising: 
       a transmission section that (i) transmits a first data mapped based on a first 16 QAM constellation pattern in a first transmission, and (ii) retransmits a second data mapped based on a second 16 QAM constellation pattern in a retransmission, wherein said second 16 QAM constellation pattern is obtained, as an arranged pattern of a bit sequence (i 1 q 1 i 2 q 2 ), by exchanging positions of i 1  and i 2 , by exchanging positions of a 1  and q 2 , and by logically inverting i 1  and q 1 .  
     
     
       12. A transmission apparatus comprising: 
       a transmission section that (i) transmits a first data mapped based on a first 16 QAM constellation pattern in a first transmission, and (ii) retransmits a second data mapped based on a second 16 QAM constellation pattern in a retransmission, wherein said second 16 QAM constellation pattern is obtained, as an arranged pattern of a bit sequence (i 1 q 1 i 2 q 2 ), by exchanging positions of i 1  and i 2 , by exchanging positions of q 1  and q 2 , and by logically inverting i 2  and q 2 .  
     
     
       13. A transmission apparatus comprising: 
       a transmission section that (i) transmits a first data mapped based on a first 16 QAM constellation pattern in a first transmission, and (ii) retransmits a second data mapped based on a second 16 QAM constellation pattern in a retransmission, wherein said second 16 QAM constellation pattern is obtained, as an arranged pattern of a bit sequence (i 1 q 1 i 2 q 2 ), by logically inverting i 2  and q 2 .  
     
     
       14. A communication terminal apparatus equipped with the transmission apparatus according to  claim 11 ,  12  or  13 . 
     
     
       15. A base station apparatus equipped with the transmission apparatus according to  claim 11 ,  12  or  13 . 
     
     
       16. A transmission method comprising: 
       transmitting a first data mapped based on a first 16 QAM constellation pattern in a first transmission, and  
       retransmitting a second data mapped based on a second 16 QAM constellation pattern in a retransmission, wherein:  
       said second 16 QAM constellation pattern is obtained, as an arranged pattern of a bit sequence (i 1 q 1 i 2 q 2 ), by exchanging positions of i 1  and i 2 , by exchanging positions of q 2  and q 2 , and by logically inverting i 1  and q 1 .  
     
     
       17. A transmission method comprising: 
       transmitting a first data mapped based on a first 16 QAM constellation pattern in a first transmission, and  
       retransmitting a second data mapped based on a second 16 QAM constellation pattern in a retransmission, wherein:  
       said second 16 QAM constellation pattern is obtained, as an arranged pattern of a bit sequence (i 1 q 1 i 2 q 2 ), by exchanging positions of i 1  and i 2 , by exchanging positions of q 1  and q 2 , and by logically inverting i 2  and q 2 .  
     
     
       18. A transmission method comprising: 
       transmitting a first data mapped based on a first 16 QAM constellation pattern in a first transmission, and  
       retransmitting a second data mapped based on a second 16 QAM constellation pattern in a retransmission, wherein:  
       said second 16 QAM constellation pattern is obtained, as an arranged pattern of a bit sequence (i 1 q 1 i 2 q 2 ), by logically inverting i 2  and q 2 .